Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
  • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
  • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
  • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
  • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
  • G01N21/21—Polarisation-affecting properties
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N1/00—Sampling; Preparing specimens for investigation
  • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
  • G01N1/38—Diluting, dispersing or mixing samples
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
  • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
  • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
  • G01N21/255—Details, e.g. use of specially adapted sources, lighting or optical systems
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
  • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
  • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
  • G01N21/27—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration
  • G01N21/274—Calibration, base line adjustment, drift correction
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
  • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
  • G01N33/483—Physical analysis of biological material
  • G01N33/4833—Physical analysis of biological material of solid biological material, e.g. tissue samples, cell cultures
• • G06K9/00134—
• • G06K9/2036—
• • G—PHYSICS
  • G06—COMPUTING; CALCULATING OR COUNTING
  • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
  • G06V20/00—Scenes; Scene-specific elements
  • G06V20/60—Type of objects
  • G06V20/69—Microscopic objects, e.g. biological cells or cellular parts
  • G06V20/693—Acquisition
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N2201/00—Features of devices classified in G01N21/00
  • G01N2201/12—Circuits of general importance; Signal processing
  • G01N2201/129—Using chemometrical methods

Definitions

• the present invention relates to the field of hair analysis from microscope digital pictures of the hair in polarized light.
• Hair analysis has been used from many years to assess human systemic level of metal elements. Hair is widely accepted for assessing toxic elements exposure and level of essential metals. The correlation of the analytical data with diseases, metabolic disorders and nutritional status is still object of extensive investigations, aimed to use hair analysis in routine diagnosis, prognosis and therapeutic treatments.
• hair Compared to other types of clinical specimens, hair has different use and even some advantages over blood, urine and saliva. While the latter fluids tend to show current or recent body status, hair represent a longer timeframe strictly related to the long-term metabolism (Watts D., Trace Elements and Other Essential Nutrients: Clinical application of tissue mineral analysis , InterClinical Laboratories Educational Publications, 2003).
• TMA thermo-mineralogram analysis
• the patent application EP 2 518 474 discloses a method to determine the chemical composition of the hair by irradiating the hair with polarized light, obtaining a microscope digital pixel-based image (pattern) in refracted polarized light, and elaborating the pattern according to a deconvolution (unmixing) method, whereby the amount of each analyte present in the hair sample is calculated.
• the microscope digital pixel-based image, or image pattern of the hair is the microscope picture of the hair under irradiation and refraction of the polarized light.
• the image is collected as a digital-based picture, as with the cameras available in commerce (e.g. not possible with the old generation negative tape cameras), being suitably connected to the ocular of the microscope
• the method allows the determination of a large number of analytes in the hair, such as metals, aminoacids, drugs, hormones, vitamins, pollutants, poisons, etc., thus providing useful information of the physiological and pathological status of the patient and a different “reading” and prospective of the human body functionality beside the standard diagnostics such as blood and urine.
• analytes in the hair such as metals, aminoacids, drugs, hormones, vitamins, pollutants, poisons, etc.
• deconvolution or unmixing is an algorithm-based process used to reverse the effects of convolution on recorded data.
• the object of unmixing is to find the solution of a convolution equation of the form:
• y( ⁇ ) represent the recorded signal and is a linear mixing of e k ( ⁇ ), reference function of the k pure elements or end members, and a k , relative positive weight of each pure elements whose sum must be equal to one.
• the application of the unmixing algorithm determines the relative contribution of each single analyte to the overall digital picture of the hair sample, providing an assessment of the analytes in the hair sample as absolute amount or concentration (ppm, ⁇ g/mg, etc.).
• Example 7 of EP 2.518.474 shows the practical application of the method, whereby a single hair is poured onto a glass in the microscope with polarized light, photographed (focused) six times each picture is then elaborated via unmixing.
• the procedure described in said patent document entails the disadvantage of poor stabilization of the hair to be observed, with the risk that different pictures of the same hair may involve different quality/image resolution, different emitted light patterns, causing a significant variation of assessed analytes amounts.
• the new method according to the invention is thus essentially characterized by the following steps, synergistically cooperating to enhanced accuracy:
• a testing phase comprising: opening the container and extracting a set of hair; contacting said set of hair with a turpentine oil; taking one or more microscope digital pictures in polarized light of said set of hair and further processing said pictures to obtain the analyte amount information.
• the high accuracy of the present method was obtained despite movements deliberately applied to the glass support containing the hair: this shows that the new method is substantially “movement-proof”, i.e. it ensures a high reproducibility of the analyte determination, even in presence of accidental movements applied to the microscope/sample to be analyzed, such as inadvertently occurring during daily laboratory practice. Also advantageously, such high accuracy was obtained while involving different operators in the procedure, thus showing that the method is substantially unaffected by different ways of manipulating/preparing/photographing the hair sample. A new of polarized light-based hair analysis procedure is thus provided, meeting commercial demands for high accuracy and increased manual practicality
• the present invention discloses new improved conditions for performing the method of hair analysis described in the patent application EP 2 518 474; according to said application, the chemical composition of the hair is determined by irradiating the hair with polarized light, obtaining a microscope digital pixel-based image (pattern) in refracted polarized light, and elaborating the pattern according to a deconvolution (unmixing) method, whereby the amount of each analyte present in the hair sample is calculated.
• Step-wise, the method of EP 2 518 474, comprises:
• the calibration phase a) needs not be performed every time before analysing a hair sample. It is generally sufficient to perform it once and then use the resulting light patterns of the pure analytes (end members) as references for an unlimited number of hair samples analysis; these will then include steps b) and c) only.
• the calibration and measuring phases a) and b) require the same methodology, the difference being in the sample tested, respectively the pure analyte or the hair sample to be analysed. Said methodology requires:
• the pure analyte e.g. sodium, potassium
• the pure analytes are placed on a microscope glass.
• the microscope is provided with source of a polarized light which works in the visible range typically at a wavelength from 350 to 800 nm, projecting a beam of polarized light onto the observation glass of the microscope through the sample under observation.
• a polychromatic white light is generated by a lamp and polarized by a standard polarizing filter.
• the microscope is also equipped with (or connected to) a digital camera, with a screen capacity of at least seven million pixels to take pictures of the pure analytes and hair samples (bulb area) under observation. The wavelength and transmittance intensity are then determined for each pixel of the picture.
• step c well-known unmixing algorithms can be used. Examples thereof are the commercial products Unmixing_MCSU, PoissonsNMF, Farsight, Chrysalis, or IDL (Societá Italiana degli autori ed Editori, registration. no. 006091).
• the unmixing algorithm evaluates the wavelength and absorbance in each pixel and then compares the absorbance of all the pure analytes at that single wavelength value.
• the unmixing algorithm is applied via a software-assisted processing, which enables reaching the final result in a reasonable amount of time e.g. EP 2 518 474 teaches unmixing is performed only considering the relative weight of the most absorbing analytes at each detected wavelength.
• a corresponding list of analytes in descending order of absorbance is produced accordingly; within this list, only a fraction of analytes, i.e. those with highest absorbance, are considered for processing by unmixing.
• the threshold is typically set at about 15% of the total number of analytes under analysis, since the contribution of absorbance from the other analytes is negligible or zero (e.g. in a list of 70 analytes, only the first 10 are considered for the unmixing processing).
• the sample is photographed n times (e.g. 4 to 10), producing n pre-matrixes, whose data are then averaged to construct the actual final matrix.
• each hair picture is analyzed in its pixel components, i.e. wavelength and absorbance.
• the IDL software applies then automatically the unmixing elaboration to the pixel, by selecting among all those end-members (pure analytes) those effectively contributing to the absorbance at that wavelength.
• the automatic elaboration of all the pixels will provide then the contribution of each end-members and, consequently, the quali-quantitative composition of these analytes in the hair.
• the present invention provides a new improved way of performing the afore described method of hair analysis, known as such from patent application EP 2 518 474; in fact the present inventors have surprisingly found that a sustained contact between the hair and certain polymeric materials, within a closed environment and for a sufficient time, is capable to affect the hair structure in such a manner that, after suspension of the same in specific oils, the light pattern emitted by the hair upon exposure to polarized light becomes more constant, i.e. less affected by the particular positioning of the hair on the observation glass and/or its orientation with respect to the source of polarized light.
• the present improved method thus requires two essential phases i.e.: (i) a conditioning phase, ensuring the contact of the hair with the polymeric material and (ii) an observation phase in which the hair is contacted with/supported by said specific oils.
• the conditioning phase (i) is performed prior to phase b) of the method of hair analysis of EP 2 518 474.
• the polymeric material making up the container is critical. In fact, only polyethylene or the polymers positioned lower than polyethylene in the triboelectric series (ordered from positively to negatively chargeable materials), were found effective in obtaining, in combination with the present oils, the requested enhancement in reproducibility.
• the triboelectric series ranks polymeric materials in function of their triboelectric effect.
• the triboelectric effect or triboelectric charging is a type of contact where certain materials become electrically charged after they come into frictional contact with a different material by exchanging electrons between them. Because the electron transfer between different materials is not immediately reversible, the excess electrons in one material remain left behind, while a deficit of electrons occurs in the other one. Thus, a material can develop a positive or negative charge that dissipates after the materials separate.
• the polarity and strength of the charges produced by friction differ according to the materials. Materials can therefore be listed in order of polarity of the charge separation when they are touched with another object: the triboelectric series.
• polymers usable in the frame of the present invention are: polyethylene and those positioned lower to it, like polypropylene, polydiphenyl propane carbonate, polyimide, polyethylene terephthalate, polyvinyl chloride, polytrifluorochloroethylene, polytetrafluoroethylene, etc.
• polyethylene and polymers positioned below it in the triboelectric series can also be defined as “negatively charged polymers” in the triboelectric series; however, it must be underlined that the “chargeability” underlying the triboelectric effect is that of the polymeric material, not of its constituting molecules, i.e. it does not correlate with the positive or negative charges possibly carried by the polymer at molecular level.
• Typical example is polyacrylate, which is higher than polyethylene in the triboelectric series, therefore having a weak tendency to be positively charged when frictioned with polyethylene, although its molecule is a polyelectrolyte bearing negative charges.
• the expression “polymeric material making up the container” means that the container can be made in-bulk of said material only or, alternatively, said polymeric material accounts for a predominant part of the container, e.g. more than 50%, preferably more than 70%, even more preferably more than 90% by weight of the container; the expression “polymeric material making up the container” also includes the possibility that the polymeric material is layered on the surface of the container, preferably its inner surface: in such cases the said material polymeric will represent a predominant part of the layer, e.g. more than 50%, preferably more than 70%, even more preferably more than 90% by weight of the layer; in such cases the remainder of the container can be indifferently made of any materials, insofar as they are compatible with the layered polymeric material.
• the container used in phase (i) is adapted to contain one or more hair, typically a hair sample which may contain a variable number of hair, e.g. from 50 to 200; the container also includes an air-tight sealable opening through which the hair (or hair sample) can be introduced and subsequently extracted.
• the sealing can be reversible or irreversible: in the first case the same container can be opened/closed more times, allowing repeated storing of different hair samples; alternatively, the sealing can be irreversible, requiring rupture thereof to extract the hair, in which case the container will be disposed after a single use. No specific limitations are present as to the form of the container: this can be a e.g.
• small bag, envelope, tube, box were “small” defines to containers suitable to contain 50-200 hair, e.g. with an inner volume of a few mm 3 , e.g. 1-30 mm 3 .
• Proportionally larger containers are usable for proportionally larger hair samples.
• the storage time is also important to allow a sufficient conditioning of the hair: the time is typically longer than half a day and is typically comprised between half a day and five days.
• the storage temperature has also influence and is preferably comprised between 15 and 35° C.; the pressure inside the container is normally the atmospheric one, however storing under vacuum or under pressure in not excluded.
• the present phase (ii) represents a new, specific way of performing the phase b) of the hair analysis method of EP 2 518 474.
• the supporting liquid used is critical. In fact, among various fixative liquids, only turpentine oils were found to significantly enhance the accuracy of the present method, and only if applied to hair previously stored according to the materials/conditions of step (i).
• the container is opened and one or more hair, typically 1-20 hair, e.g. 6-8 hair, are extracted and used for analysis purpose. The hair is then contacted with a suitable amount of a turpentine oil: the turpentine oil can be selected from e.g. tir turpentine (also known as Canada balm) or pinewood tupentine.
• the contact between hair and oil is preferably effected directly on the microscope glass, on which the two components can be placed in indifferent order; in alternative, the two component are mutually contacted at a different location and then transferred upon the microscope glass by using a standard mean, e.g. a little spoon, pipette, etc.
• the supporting liquid used in present phase ii) can also be used as supporting liquid in the initial calibration phase of the hair analysis method, in which the light patterns of pure analytes (end members) are construed.
• the digital pictures (light patterns) obtained from the present phase ii), and the corresponding light patterns of the pure analytes (end members) obtained in the initial calibration phase are then processed according to phase c) of the hair analysis method of EP 2 518 474, to obtain the actual information on analyte amount.
• the parameters and methodology for performing the polarized light analysis and the analyte determination are well-known in the art.
• the digital pictures (light patterns) of the hair are processed via software-assisted unmixing as described e.g. in EP 2 518 474, determining the relative contribution of each analyte present in the hair sample; the light patterns are typically a matrix of points corresponding to the number of pixels of the photographic image of the hair. Further details of the method are described in EP 2 518 474, herein incorporated by reference.
• the present method has no particular limitation as to the type and number of analytes which can be determined. It allows the quantification of analytes in the hair, such as metals, aminoacids, drugs, hormones, vitamins, pollutants, poisons, etc., thus providing useful information of the physiological and pathological status of the patient and a different “reading” and prospective of the human body functionality beside the standard diagnostics such as blood and urine.
• testable analytes are:
• Examples of preferred analytes are alkaline or earth alkaline metals, in particular potassium, lithium, magnesium.
• the authors have also tested further parameters to check carefully the accuracy of the measurement taking into account the operational steps from sampling to make pictures of the hair. These steps include sampling 50-100 hair in a sampling centre, pouring them in a small bag or container, sending them to a laboratory, preparing them on the microscope glass with a stabilizing liquid and making their pixel-based pictures in polarized light. The pictures are then elaborated by unmixing as previously described for the quantification of the analytes.
• the successive operator (B) then removes the hair from the glass and repeats the same operations as above using the same supporting liquid and glass. Analogously, the same operations are carried out one by one by the successive operators (C to F).
• a second hair is taken out from the pool for testing with a second liquid by the six operators as above.
• the entire procedure is iteratively carried out by taking out a new hair from the pool, which is tested with a different supporting liquid.
• hair sample About 50-100 hair are sampled from the latero-parietal area of the head of a volunteer and pooled together.
• the hair sample is split and poured in small bags (pouches) made of different materials. All bags are sealed and stored at temperature of about 20-30° C. for a period of one day. At the end of the conditioning period, the bags are opened and a single hair is taken from each of them for microscope analysis.
• the hair without any supporting liquid, is then poured onto a microscope glass, which is then placed in a microscope (Olympus BH2) equipped with a polarizing filter (Nikon). Eight digital pictures of refracted polarized light are made using a digital camera (Nikon D70S). After each photography, the glass is gently removed and placed again in the microscope. The analytes are evaluated by means of the unmixing algorithm-based process as in EP 2.518.474.
• the successive operator (B) then removes the hair from the glass and repeats the same operations as above using the same glass. Analogously, the same operations are carried out one by one by the successive operators (C to F).
• the relative standard deviation (RSD) of the three most critical elements is determined for each material.
• a small bag made of the following materials: paper, rayon, nylon, aluminum (Al), polyethylene (PE), polypropylene (PP) and polyvinylchloride (PVC). All bags are sealed and stored at temperature of 20-30° C. for a period of one day. At the end of the conditioning period, the bags are opened and a single hair is taken from each of them for microscope analysis.
• the hair from a first bag is immersed by the first operator (A) in a supporting liquid.
• the glass is then placed in a microscope (Olympus BH2) equipped with a polarizing filter (Nikon).
• Eight digital pictures of refracted polarized light are made using a digital camera (Nikon D70S). After each photography, the glass is removed and placed again in the microscope.
• the analytes are evaluated by means of the unmixing algorithm-based process as in EP 2.518.474.
• the successive operator (B) then removes the hair from the glass and repeats the same operations as above using the same supporting liquid and glass. Analogously, the same operations are carried out one by one by the successive operators (C to F).
• a second hair is taken out from the same pool for testing with a second supporting liquid by the six operators as above.
• the entire procedure is iteratively carried out by taking out a new hair from the pool, which is tested with a different supporting liquid.
• the supporting liquids are castor oil, glycerol, ethylene glycol, DPX-Mountant, Neo-MountTM, fir turpentine (Canada balsam) and pinewood turpentine.
• the relative standard deviation (RSD) of the three most critical elements is determined for each liquid used as a support.

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